Aero Precision AR15/M4E1 Field Repair Kit Black. The AR15/M4E1 Field Repair Kit features common parts that may rattle loose or break. Carry one in your range bag and always have what you need to get your rifle up and running again Specifications for Aero Precision AR15/M4E1 Field Repair Kit: Manufacturer: Aero Precision Color: Black Gun Model: AR-15 Condition: New Quantity: 1 Country of Origin: USA Package Contents: Aero Precision AR15/M4E1 Field Repair Kit AR15 Takedown Pin Detent (2) Takedown Pin Spring (2) Roll Pin Fwd Assist (2) Bolt Catch Spring (2) Bolt Catch Buffer Bolt Catch Roll Pin (2) Trigger/Hammer Pin Safety Selector Spring Safety Selector Detent Buffer Retainer Buffer Retainer Spring (2) Trigger Guard Roll Pin (2) Pistol Grip Screw Pistol Grip Lock Washer Trigger Spring Hammer Spring Disconnector Spring Nylon Tipped Tension Set Screw - 1/4-28 x 1/2 4-40 Set Screw (for threaded takedown pin detent hole) (2) Threaded Roll Pin M4E1 Lower Bolt Catch Pin What firearm models does the manufacturer say Aero Precision AR15/M4E1 Field Repair Kit is compatible with? The manufacturer says that Aero Precision AR15/M4E1 Field Repair Kit is compatible with AR-15Aero Precision APRH101625: AR15/M4E1 Field Repair Kit Black